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Region Hovedstadens Psykiatri - en del af Københavns Universitetshospital
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Long-term trajectories of positive and negative symptoms in first episode psychosis: A 10 year follow-up study in the OPUS cohort

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Objective:
Knowledge about course of illness can help clinicians to develop effective interventions and improve treatment outcomes. The goal of this study was to construct positive and negative symptom trajectories based on structured clinical assessments collected over 10 years within a cohort of people with first episode psychosis.
Method:
A cohort of 496 people with first episode psychosis (ICD-10, F20-28) originally recruited for the OPUS study (1998–2000) and treated in community psychiatric serviceswere rated on clinical symptoms at 5 different occasions across ten years. Psychopathology was assessed using the Scales for Assessment of Positive and Negative Symptoms. Symptom trajectories were constructed using Latent Class Analysis.
Results:
Five distinct trajectories were identified for positive symptoms (response — 47%, delayed response — 12%, relapse — 15%, non-response — 13% and episodic response — 13%). Four distinct trajectories were identified for negative symptoms (response — 28%, delayed response — 19%, relapse — 26% and
non-response—27%).Multivariable regression analysis of baseline characteristics identified that longer duration of untreated psychosis (OR 1.27–1.47, p b 0.05) and substance abuse (OR 3.47–5.90, p b 0.01) were associated with poorer positive symptom trajectories (higher levels of psychotic symptoms) while poor social functioning (OR 1.34–5.55, p b 0.05), disorganized symptoms (OR 2.01–2.38, p b 0.05) and schizophrenia diagnosis (OR 5.70–8.86, p b 0.05) were associated with poorer negative symptom trajectories (higher levels of negative
symptoms). A proportion of people displayed significant changes in symptoms several years after diagnosis.
Conclusions:
Trajectories of illness for positive and negative symptoms were heterogeneous among people with first episode psychosis. Positive symptoms showed a general pattern of reduction and stabilization over time while negative symptoms typically showed less variation over the ten years. Results have implications for the focus, timing and length of interventions in first episode psychosis.
OriginalsprogEngelsk
TidsskriftSchizophrenia Research
Vol/bind168
Udgave nummer1-2
Sider (fra-til)84-91
Antal sider8
ISSN0920-9964
DOI
StatusUdgivet - okt. 2015

ID: 45703357